Overcoming Oral Delivery Barriers for Therapeutic Proteins and Peptides: Current Strategies Review
Current oral protein/peptide delivery strategies including nanoparticles, lipid systems, permeation enhancers, and enzyme inhibitors show progress but bioavailability remains limited, requiring multi-barrier approaches.
Quick Facts
What This Study Found
Current oral peptide delivery strategies (NPs, lipids, permeation enhancers, enzyme inhibitors, targeted release) show progress but bioavailability remains typically <10%, requiring integrated multi-barrier approaches.
Key Numbers
How They Did This
Review of functional food protein/peptide oral delivery technologies, covering barriers, strategies, and current bioavailability limitations.
Why This Research Matters
Most peptide drugs require injection. Solving oral delivery would transform treatment adherence for millions of patients.
The Bigger Picture
Oral peptide delivery is the holy grail of pharmaceutical formulation — solving it would affect insulin, GLP-1, AMPs, and countless other peptide drugs.
What This Study Doesn't Tell Us
Most studies in vitro or animal. Human oral bioavailability consistently lower than preclinical predictions.
Questions This Raises
- ?Will combination strategies achieve >20% oral bioavailability?
- ?Can AI predict optimal formulation-peptide combinations?
- ?When will oral insulin with meaningful bioavailability reach market?
Trust & Context
- Key Stat:
- <10% barrier Despite numerous strategies, oral peptide bioavailability typically remains below 10% — the persistent challenge of oral peptide drug delivery
- Evidence Grade:
- Comprehensive review of delivery technologies and their current limitations.
- Study Age:
- Published in 2025.
- Original Title:
- Overcoming oral delivery barriers of functional proteins: current status and advanced delivery technologies.
- Published In:
- Food chemistry, 503, 147818 (2026)
- Authors:
- Jianghao, Zhang, Shadrack, Salumu Masuwa, Mingcheng, Wang, Shichao, Mi, Mengjia, Chu, Rakariyatham, Kanyasiri, McClements, David Julian, Chongjiang, Cao, Xiao, Xu, Biao, Yuan
- Database ID:
- RPEP-15386
Evidence Hierarchy
Frequently Asked Questions
Why can't most peptide drugs be taken as pills?
Stomach acid destroys them, digestive enzymes break them down, and the intestinal wall blocks absorption. Current solutions improve this but typically deliver less than 10% of the dose.
What is the best oral peptide delivery approach?
No single approach works well alone. The most promising strategies combine protection (nanoparticles), absorption enhancement (permeation enhancers), and targeted intestinal release simultaneously.
Read More on RethinkPeptides
Related articles coming soon.
Cite This Study
https://rethinkpeptides.com/research/RPEP-15386APA
Jianghao, Zhang; Shadrack, Salumu Masuwa; Mingcheng, Wang; Shichao, Mi; Mengjia, Chu; Rakariyatham, Kanyasiri; McClements, David Julian; Chongjiang, Cao; Xiao, Xu; Biao, Yuan. (2026). Overcoming oral delivery barriers of functional proteins: current status and advanced delivery technologies.. Food chemistry, 503, 147818. https://doi.org/10.1016/j.foodchem.2025.147818
MLA
Jianghao, Zhang, et al. "Overcoming oral delivery barriers of functional proteins: current status and advanced delivery technologies.." Food chemistry, 2026. https://doi.org/10.1016/j.foodchem.2025.147818
RethinkPeptides
RethinkPeptides Research Database. "Overcoming oral delivery barriers of functional proteins: cu..." RPEP-15386. Retrieved from https://rethinkpeptides.com/research/jianghao-2026-overcoming-oral-delivery-barriers
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkPeptides research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.